If you have 6 hours or a half day to spend in Shrewsbury, here are some suggestions:
1. Visit Shrewsbury Castle - The castle was built in the 11th century and has a history of over 900 years. You can visit the castle and explore the grounds. Allow around 1-2 hours for your visit.
2. Stroll around The Quarry - The Quarry is a beautiful park located in the heart of the town. You can take a walk around the park and enjoy the scenery. Allow around 1-2 hours for your visit.
3. Explore Shrewsbury's museums - Shrewsbury has several museums, including the Shrewsbury Museum and Art Gallery, the Coleham Pumping Station, and the Shrewsbury Prison. Allow around 1-2 hours for each museum.
4. Go shopping - Shrewsbury has a variety of independent and chain stores to suit any taste and budget. You can explore the town center and do some shopping. Allow around 1-2 hours for your visit.
5. Visit the Abbey - Shrewsbury Abbey is a beautiful medieval church located in the town center. You can visit the church and enjoy the architecture. Allow around 1-2 hours for your visit.
Overall, there are plenty of things to do in Shrewsbury to keep you occupied during your 6-hour visit or half-day. Choose a few activities that interest you the most.